苏北—南黄海盆地海相中—古生界密度和速度分析及其地震反射模型构建  

Density and velocity analysis and seismic reflection model construction of marine Mesozoic-Paleozoic in the North Jiangsu-to-South Yellow Sea Basin

作　　者：雷宝华[1,2,3] 陈建文 吴志强[1,2,3] 张银国 梁杰[1,2,3] 李刚 

机构地区：[1]中国地质调查局青岛海洋地质研究所,山东青岛266071 [2]青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛266071 [3]国土资源部海洋油气资源与环境地质重点实验室,山东青岛266071

出　　处：《石油地球物理勘探》2018年第3期558-567,共10页Oil Geophysical Prospecting

基　　金：国土资源部海洋油气资源与环境地质重点实验室开放基金项目(MRE201316);国家地质调查专项课题(DD20160512;GZH200800503)联合资助

摘　　要：苏北—南黄海盆地海相中—古生界地震成像难度大,给油气勘探及相关研究带来巨大困难。从地震反射波成因于岩石密度和速度的差异这一原理,构建适用的反射模型,识别地震标志层,推测地层归属。通过充分调研该区目的层密度和速度资料,分析和对比获取这些资料的四种方法和途径,总结速度和密度随岩性、地层年代、埋深和成岩作用的变化特征,然后构建了该区目的层的速度、密度和地震反射模型,并与实际地震资料进行对比。研究认为:目的层上部海相地层中碳酸盐岩与碎屑岩在速度、密度物性上差异大,下部地层这种差异较小;在构建的地震反射模型中,古生界内部存在3个强反射标志层,分别对应下二叠统栖霞组/孤峰组界面、下石炭统高骊山组/和州组界面和上奥陶统汤头组/五峰组界面。模型界面可与南黄海盆地古生界深部优质层段地震资料对比。Seismic imaging of marine Mesozoic-Paleozoic is difficult in the North Jiangsu-to-South Yellow Sea Basin,which brings many difficulties to the pe-troleum exploration.A reflection model can be built based on the principle that rock density and velocity differences cause different seismic reflection waves,and seismic markers can be recognized and formation properties can be predicted.Therefore we investigate target density and velocity data in the study area,analyze velocity and density variation with depth,lithology,stratigraphic,and diagenesis.Then we build velocity,density,and reflection models of the target,and compare them with seismic data.Based on this research,there is large difference in velocity and density between carbonate rocks and clastic rocks in the upper marine strata of the target,and there is little difference between them in the lower strata.In the built reflection model,there are 3 markers of strong reflection in the Paleozoic,corresponding to 3 interfaces:they are the interface between Qixia formation and Gufeng formation in the lower Permian,the interface between Gaolishan formation and Hezhou formation of the Lower Carboniferous,and the interface between Tangtou formation and Wufeng formation of the upper Ordovician.These model interfaces can compare with the first quality of latest seismic data in the South Yellow Sea Basin.

关 键 词：速度和密度 地震反射模型 海相地层 苏北盆地 南黄海盆地 

分 类 号：P631[天文地球—地质矿产勘探]